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PCR analysis of the osmC clyA DNA regions of various Salmonella isolates. PCR products were resolved by agarose gel electrophoresis following amplification using the primers stm1 and stm3, which amplify a 433- or a 420-bp fragment in strains lacking both clyA and osmC and a 2,650-bp fragment in clyA+ osmC+ strains (arrowheads on right and left, respectively).
